Ventilation system and A/C compressor
Thread Starter
Drifting
Joined: Oct 2006
Posts: 1,340
Likes: 6
From: Redmond WA
Ventilation system and A/C compressor
Is there any way to direct air to the windshield and NOT have the a/c compressor come on? We run that way in all of our other vehicles from October through March and manually engage the compressor when it's needed to unfog the windows, but in the Corvette, the compressor runs practically continuously when any air is directed to the windshield, despite pressing the compressor-off button and having the HVAC display show that the compressor is off.
Is this something dealer programmable?
Is this something dealer programmable?
Racer
Joined: Apr 2006
Posts: 486
Likes: 2
From: The Villages FL
I assume you understand why the A/C compresor is on in defog/defrost mode. I am curious why you want to alter this. Does the dehumidified air dry your eyes? To program this you would have to get someone to activate the compressor descrete switch in defrost mode. A dealer wouldn't touch that. My guess is if a seperate switch were wired into the compresor clutch wire or the compressor clutch relay B+ (underhood fuse block) that might cause the system to throw a code.
Thread Starter
Drifting
Joined: Oct 2006
Posts: 1,340
Likes: 6
From: Redmond WA
Yes, I understand why the compressor is on in defrost mode, but from October through March, the temps are between 35 and 55 degrees F., and both my wife and I wear contact lenses. With clean windows, it just doesn't fog unless we're sweating from working out or are wet from having gotten soaked in the rain. So, we have just always directed air towards the windshield these five or six months, but in every car we've had up until now, we could control the compressor as well and in the case of our 2010 Rav, it is a dealer programmable option whether or not to have the compressor explicitly obey the position of the A/C button.
Thanks for the info regarding the compressor. Sounds like it's not going to be easy.
Thanks for the info regarding the compressor. Sounds like it's not going to be easy.
Team Owner
Joined: Sep 2000
Posts: 24,989
Likes: 2,691
From: Far NW 'burbs of Chicago
St. Jude Donor '13
So if you select the Defrost position and then push the Snowflake to turn off the compressor, the compressor continues to run?
Normally, I think the compressor only runs "when needed". If you can't turn it off, maybe selecting a slightly higher temperature would cause it to shut down at least for a while.
Grasping at straws...
Normally, I think the compressor only runs "when needed". If you can't turn it off, maybe selecting a slightly higher temperature would cause it to shut down at least for a while.
Grasping at straws...
Thread Starter
Drifting
Joined: Oct 2006
Posts: 1,340
Likes: 6
From: Redmond WA
I'll ask the dealer to see what they say. I have a feeling it's going to be an interesting conversation.
Drifting
Joined: Apr 2006
Posts: 1,276
Likes: 5
From: Ambler Pa.
Is there any way to direct air to the windshield and NOT have the a/c compressor come on? We run that way in all of our other vehicles from October through March and manually engage the compressor when it's needed to unfog the windows, but in the Corvette, the compressor runs practically continuously when any air is directed to the windshield, despite pressing the compressor-off button and having the HVAC display show that the compressor is off.
Is this something dealer programmable?
Is this something dealer programmable?
